The Poofy-Poof Spell

Effect: You create a magical cloud of stench that fills a 20-foot cube within range. All creatures in the area must make a Constitution saving throw. On a failed save, the creatures are affected by the overwhelming odor, becoming distracted and disoriented. For the duration, affected creatures emit a putrid green aura, and all attack rolls made against them have advantage. On a successful save, the creature is unaffected by the spell.
Additional Effect: The affected creatures emit soft, sputtering sounds from their bum bums.